package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DeleteOperation implements IOperation {

    public void work(BookList bookList) {
        System.out.println("删除图书");

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书的名字：");
        String name = scanner.nextLine();

        int index = 0;
        int currentSize = bookList.getUsedSize();
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getPos(i);
            if (book.getName().equals(name)) {
                index = i;
                break;
            }
        }

        if (i == currentSize) {
            System.out.println("没有你要删除的图书！");
            return;
        }

        for (int j = index; j < currentSize-1; j++) {
            Book book = bookList.getPos(j+1);
            bookList.setBooks(j, book);
        }

        bookList.setBooks(currentSize-1, null);
        bookList.setUsedSize(currentSize-1);
    }
}
